We doubled the pressure differential and hence the flow through
the rad by adding this cowl flap. The data report will
be along shortly. Coolant temp dropped 20 to 30 degrees
but it was a cooler day. For that reason the jury is still
out on whether the cooling is adequate yet.


The problem here is it is tough to install
adjustable cowl flaps as the bottom of the Pulsar cowl
opening is a compound curve. That means we need segmented
flapettes :) And a complicated control system in the bargain.

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Here is the spread sheet data. The pressure in the cowl
while running up on the ground was .2 to .3 inches of H2O higher
than static surprisingly. Once in the air it lowered to .8 to 1.4 inches
of H2O below static. That was the goal of the cowl flap and to be expected.
Cowl flaps do work. Alex also thought the airplane was a
couple of MPH slower.

Paul Lamar

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